Install Beam SDK with ccache for faster re-install.
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harness
improvement
P3
python
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- Java
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Description
Re-compliling the C modules of the SDK takes 2-3 minutes. This adds to worker startup time whenever a custom SDK is being used (in particular, during development and testing). We can use ccache to re-use the old compile results when the Cython files have not changed.
Imported from Jira [BEAM-8544](https://issues.apache.org/jira/browse/BEAM-8544). Original Jira may contain additional context.
Reported by: robertwb.
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